work in progress!
My own implementation of TCP!
Inspired by @jonhoo's live streaming of Rust TCP implementation.
It is not an exhaustive implementation, but one that is enough to communicate with common-level TCP sockets.
There are many ways to access the network interface from the application process. We could use pcap API, or pnet crate that gives access to the raw sockets. However, we will use TUN/TAP interface for our use.